Pour marinara sauce in the bottom of the 9x13" pan until it's coated, about 1/2 inch thick.
Place 3 oven-ready pieces of lasagna evenly across pan (they will expand when baking).
On top of noodles, spoon a very thin layer of marinara sauce. Spread evenly. Dollop with the cheese mixture and spread it evenly across. Then add meat and sprinkle evenly across. Top with another thin layer of red sauce.
Add 3 more pieces of the oven-ready lasagna and continue layering until you have 4-5 layers. I like as many layers as I can get.
When you are done, finish the top with a layer of noodles, marinara, and then top with the slices of fresh mozzarella cheese.
Cover loosely with tinfoil and bake for 25 minutes, covered.
Then remove cover and bake for 10-15 more minutes until red sauce is bubbling and cheese begins to turn light golden brown.
Remove from oven and let rest for 10-15 minutes before cutting and serving.
The fresh mozzarella on top can be very stretchy (delicious!) but hard to cut, so use a sharp knife to cut into this. Cut into squares and serve. Top with additional parsley and/or fresh parm if desired. Enjoy!